#include <stdio.h>


int main()
{
    int i,j,a[4],n;
    for(i = 0;i < 4;i++)
    {
        for(j = 0;j < 4;j++)
        {
            if(j == i) a[j] = 1;
            else a[j] = 0;
        }
        if(a[3] + a[1] == 1&&a[1] + a[2] == 1&&a[0] + a[1] == 1)
        {
            printf("The thief is");
            for(j = 0;j <= 3;j++)
            {
                if(a[j]) printf(" %c.",j+'A');
            }
            printf("\n");
        }
    }


    return 0;
}

//熊贤豪